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Accounts Receivable, Net
6 Months Ended
Jun. 30, 2022
Receivables [Abstract]  
ACCOUNTS RECEIVABLE, NET ACCOUNTS RECEIVABLE, NET
Accounts receivable consists of the following (in thousands):
June 30, 2022December 31, 2021
Trade accounts receivable$231,076 $185,745 
Costs in excess of billings48,421 54,437 
Total accounts receivables279,497 240,182 
Less allowance for doubtful accounts and contract assets(3,901)(3,738)
Accounts receivable, net$275,596 $236,444 

Refer to Note 4 "Revenue" concerning the Company's costs in excess of billings.

The following table provides a roll-forward of the allowance for credit losses, for the six month period ended June 30, 2022, that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected.
Beginning balance as of January 1, 2022$3,738 
Bad debt expense, net of recoveries772 
Accounts written off against allowance and other adjustments(609)
Ending balance as of June 30, 2022$3,901